mortar exploded in a launching tube. >> every loss of life is heartbreaking. whether that occurs in afghanistan, hawthorne, nevada, north carolina or anywhere else. >> this shows how troops launch mortars, although this is not video from the army base. miss fires can be stuck in the tube. the cause of monday night's explosion is unknown. >> accidents like these are very rare. that said, anytime you are handling live ordinance, the things you would actually go to war with, there is an inherent risk and an inherent danger that something could go wrong. >> and in hawthorne where a military weapon museum sits in the center of town, residents are in mourning. >> i feel for those people, the mothers, brothers, sisters, fathers, tough way to go. >> six of the wounded marines are still in a reno hospital tonight.